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Technical Data Sheet
4321161 ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The PIN,SHOULDER,HEADLESS is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 RING, shank_length: 1.958 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN, thread_class: 3B, shank_diameter: 0.873 INCHES NOMINAL IN, first_end_style: SQUARE, second_end_style: SQUARE INTERNALLY THREADED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-483-6749, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
4321161
NSN: 5315-01-483-6749
FSC: 5315
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 RING
shank_length1.958 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN
thread_class3B
shank_diameter0.873 INCHES NOMINAL IN
first_end_styleSQUARE
second_end_styleSQUARE INTERNALLY THREADED
special_featuresRETAINER ON SHANK END, SQUARE WASHER AT 1ST SHOULDER END; SHANK END 8 MICROINCH FINISH, SHOULDER 16 MICROINCHFINISH; SHOULDER 23 TO 25 DEGREE ANGLEON SHOULDER TO SHANK AREA
style_designatorSHOULDER
thread_directionRIGHT-HAND
shoulder_diameter1.310 INCHES NOMINAL IN
first_end_locationSQUARE END
first_hole_diameter0.660 INCHES NOMINAL IN
NSN5315-01-483-6749
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4321161 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
THREAD QUANTITY PER INCH: 20
SHOULDER DIAMETER: 1.310 INCHES NOMINAL IN
SHANK LENGTH: 1.958 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN
THREAD CLASS: 3B
FIRST HOLE DIAMETER: 0.660 INCHES NOMINAL IN
SECOND END STYLE: SQUARE INTERNALLY THREADED
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH20
SHOULDER DIAMETER1.310 INCHES NOMINAL IN
SHANK LENGTH1.958 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN
THREAD CLASS3B
END ITEM IDENTIFICATION119
FIRST HOLE DIAMETER0.660 INCHES NOMINAL IN
SECOND END STYLESQUARE INTERNALLY THREADED
PART NAME ASSIGNED BY CONTROLLING AGENCYPIN
HOLE ARRANGEMENT STYLEDRILLED THRU CENTER
NOMINAL THREAD SIZE0.437 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
303SFF01L0AG06A20C000000Interchangeable
interchangeable cross-reference
interchangeable
P303KDDFS50160Interchangeable
interchangeable cross-reference
interchangeable
6303-2ZJC3D0LBInterchangeable
interchangeable cross-reference
interchangeable
H2195-1084 ITEM 165Interchangeable
interchangeable cross-reference
interchangeable
MR4SW400SYHInterchangeable
interchangeable cross-reference
interchangeable
K1-241Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4321161?
4321161 is a PIN,SHOULDER,HEADLESS.
What parts can replace 4321161?
There are 7 known substitutes for 4321161: 303SFF01L0AG06A20C000000, P303KDDFS50160, 6303-2ZJC3D0LB and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4321161?
4321161 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-483-6749. This indicates validated use in U.S. government and defense supply chains.
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